Mesoporous silicon carbide nanofibers with in situ embedded carbon for co-catalyst free photocatalytic hydrogen production

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• 作者：Bing Wang ; Yingde Wang ; Yongpeng Lei ; Nan Wu ; Yanzi Gou ; Cheng Han…
• 关键词：silicon carbide ; carbon ; photocatalyst ; co ; catalyst free ; hydrogen production
• 刊名：Nano Research
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：9
• 期：3
• 页码：886-898
• 全文大小：2,626 KB
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• 作者单位：Bing Wang (1)
  Yingde Wang (1)
  Yongpeng Lei (2)
  Nan Wu (1)
  Yanzi Gou (1)
  Cheng Han (1)
  Song Xie (1)
  Dong Fang (3)
  
  1. Science and Technology on Advanced Ceramic Fiber and Composites Laboratory, National University of Defense Technology, Changsha, 410073, China
  2. College of Basic Education, National University of Defense Technology, Changsha, 410073, China
  3. College of Materials Science and Engineering, Wuhan Textile University, Wuhan, 430074, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chinese Library of Science
  Chemistry
  Nanotechnology
  
• 出版者：Tsinghua University Press, co-published with Springer-Verlag GmbH
• ISSN：1998-0000

文摘

Silicon carbide (SiC) has been considered a promising metal-free photocatalyst due to its unique photoelectrical properties and thermal/chemical stability. However, its performance suffers from the fast recombination of charge carriers. Herein, we report mesoporous SiC nanofibers with in situ embedded graphitic carbon (SiC NFs-Cx) synthesized via a one-step carbothermal reduction between electrospun carbon nanofibers and Si powders. In the absence of a noble metal co-catalyst, the hydrogen evolution efficiency of SiC NFs-Cx is significantly improved under both simulated solar light (180.2 μmol·g–1·h–1) and visible light irradiation (31.0 μmol·g–1·h–1) in high-pH solution. The efficient simultaneous separation of charge carriers plays a critical role in the high photocatalytic activity. The embedded carbon can swiftly transfer the photogenerated electrons and improve light absorption, whereas the additional hydroxyl anions (OH–) in highpH solution can accelerate the trapping of holes. Our results demonstrate that the production of SiC NFs-Cx, which contains exclusively earth-abundant elements, scaled up, and is environmentally friendly, has great potential for practical applications. This work may provide a new pathway for designing stable, lowcost, high efficiency, and co-catalyst-free photocatalysts.